<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Bootstrap环境搭建模板</title>
    <link rel="stylesheet" href="./bootstrap-3.4.1-dist/css/bootstrap.css">
    <script src="./bootstrap-3.4.1-dist/js/jQuery1.12.4.js"></script>
    <script src="./bootstrap-3.4.1-dist/js/bootstrap.js"></script>
</head>

<body>
    <style>
        .qwe{
            margin-bottom: 10px;
        }
        .qwe .col-md-12 {
            border-bottom: 2px solid rgb(201, 198, 198);
        }
        .asd{
            margin-bottom: 10px;
        }
        
        
    </style>
    <div class="container">
        <div class="row qwe">
            <div class="col-md-12">
                <h1>欢迎登陆</h1>
            </div>
        </div>
        <div>
            <input type="text" class="form-control" placeholder="手机/邮箱/用户名">
        </div>
        <div class="asd"></div>
        <div>
            <input type="text" class="form-control" placeholder="密码">
        </div>
        <div class="asd"></div>
        <div class="checkbox">
            <label>
              <input type="checkbox">下次自动登录
            </label>
          </div>
        <div class="asd"></div>
        <div class="btn-block">
           <button type="button" class="btn btn-info btn-block">提交</button>
        </div>
        </div>
    </div>
</body>

</html>